Bagasse-burning furnace.



PATENTED AUG. 22, 190'5n H. G. GINAGA.

BAGASSE BURNING FURNACE.

APPLICATION FILED MAR. 23, 1904.

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H. G. GINAG'A...

'BAGASSB BURNING FURNACE.

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BAGASSE BURNING FURNAUE.

APPLICATION FILED MAE.23,1904L No. 797,805. PATENTED AUG. 22, 1905. H.G. GINAOA. BAGASSE BURNING FURNAOE.

APPLIGATION FILED MAR. 23, 190%.

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HENRY GABRIEL GINAOA, OF HONOLULU, TERRITORY OF HAWAII,

ASSIGNOR OF ONE-HALF TO ALVIN WELTY KEEOI-I, OF HONO- LULU, TERRITORYOFv HAWAII.

Specification of Letters Patent.

Patented Aug. 22, 1965.,

Application filed March 23, 190 .1. Berial N0. 199 545.

To all whom it may concern: 7

Be it known that I, HENRY GABRIEL GINACA, a citizen of the UnitedStates, residing at Honolulu, Island of Oahu, Territory of Hawaii, haveinvented new and useful Improvements in Bagasse-Burning Furnaces, ofwhich the following is a specification.

My invention relates to furnaces for burning bagasse or trash-thewoody-fiber refuse of sugar-cane discharged from the juice-extractingmachinery and particularly to such furnaces as employ step-laddergrates.

The same principles are applied in this invention as were stated in anapplication for patent, Serial No. 178,768, filed October 27, 1908, byA. W. Keech and myself; but by the improvements in construction as arehere inafter shown and described a cheapening of the cost ofinstallation may be effected and certain other advantages are obtained,as are hereinafter set forth.

In the accompanying drawings, Figure 1 represents a longitudinalsectional elevation of a bagasse-burning furnace embodying my invention.Fig. 2 represents a similar view showing some of these improvements asapplied to an existing furnace setting. Fig. 3 represents in elevationthe front of the furnace shown in Fig. 1. plan view of the feederforming part of the furnace-front. Figs. 5, 6, and 7 represent views ofone of the twyers. Fig. 8 represents a front elevation, and Fig. 9 a topplan view, of one of the frames for setting in the brickwork for holdingthe twyers. Fig. 10 represents, on a larger scale, a side view of one ofthe plates under the feeder in Fig. 1. Fig. 11 represents an elevationat right angles to that shown in Fig. 10. Fig. 12 represents amodification of these plates. Fig. 13 represents, on a larger scale, aside View, Fig. 14 a top plan view, and Fig. 15 a rear elevation, of oneof the feeder-flaps. Fig. 16 represents a side elevation of astep-ladder bearer and its grate-bars in section, showing a drop-offmentioned hereinafter.

Similar letters of reference indicate similar parts throughout theseveral views.

' Referring to the drawings, it will be noted, Fig. 1, that the rearwall A of the furnace is carried up square, its top ending sufficientlybelow the arched top B of the furnace to permit of a suitable passage 0to under the Fig. 4: represents a top boiler. This wall A may have anarched pro ection a from or near its top for the purpose of deflectingthe gases, causlng them to go forward, then upward and over this archedprojection a before passing through the passage O to under the boiler.confine the heat in the furnace. The rear wall A contains an air-flue D,supplying air to the furnace through the twyers E above the grates F.This air-supply, which is regulated by a gate G, becomes heated inpassing through the passage D in the hot wall A previous to entering thefurnace, the object be ing to admit this air through the twyers withsufficient velocity to cause a whirl and produce a thorough admixture ofthis air and the combustible elements rising from the burning mass onthe grates. It is necessary to admit this air above the grates, as thethick layer of fuel on the grates prevents sufficient air from passingthrough the grates to effect complete combustion. The twyers E arepreferably made with an elongated opening, as shown in Figs. 5 and 6,and are placed in a horizontal row in the rear wall A,

so that the air enters through them in a layer almost the entire widthof the furnace and immediately above the layer of burning bagasse on thelower grates in order that this air may combine with the combustibles assoon as they rise from the surface of the layer of fuel, so thatcombustion may be completed as soon as possible thereafter. Frames 6(shown in Figs. 8 and 9) for holding the twyers E may be set in the rearwall A, by which arrangement the twyers E may easily be removed forcleaning or be replaced. The front wall H contains the ash-pitdoor-opening, with its frame, and in Fig. 1 is shown carried up to thelevel of the hand-firing floor K. The ash-pit doors are usually madedouble, rights and lefts, and are hinged to their frame so as to openoutward. have to be opened to clean the fire, and the amount these doorsare opened governs the amount of air admitted and allowed to pass amountof this air, I have shown sliding doors L in Figs. 1 and 3, which willremain opened any desired amount. These doors 11 may It also tends toOne or both doors slide in grooves or be mounted on wheels and are movedparallel to and just outside of the front wall. The arched top B of thefurnace ends at its forward end in the arch Z), sprung from about thelevel of the hand-firing floor K and carried up to the level of the topof the furnace. I prefer to locate this arch b a short distance in therear of the front wall H, as is shown in Fig. 1, although myimprovements may be applied by building the arch Z) in the front wall ofa furnace as at present constructed, as shown in Fig. 2. In front ofthe-face of this arch Z2 is the feeder M, with its projecting or swelledfront resting upon the top of the wall H, as in Fig. 1, or upon asuitable support or on the hand-firing floor K, as in Fig. 2. Thisfeeder M has the flaps f placed side by side on the bar 11 and eachslightly overcounterweighted to tend to keep the feeder closed. When theweight of the bagasse upon a flap f, having entered the feeder through achute, is sufficient to overcome the action of the counterweight (Z, theflap f drops to allow the bagasse to pass through the feeder, and assoon as relieved of the weight of bagasse the flap again closes. Byusing a number of flaps f in the width of the feeder M and providingeach of them with ribs g underneath and at their edges, as shown in Fig.13, very little air passes through the feeder when any of the flaps fare operating. The feeder M is preferably provided with a flap or doorit, hinged at its top and located to cover an opening in the swelledfront or lower projecting part of the feeder for use when firing byhandas when starting up, for example. This flap or door may becounterweighted z to tend to keep it closed and may have a handle 20,both of which are shown in Fig. 3. The object of the door it being madethus is to prevent as much as possible air from entering with thebagasse. When operated, the bagasse is pushed through the openingagainst the door It and the action of its counterweight z. The front ofthe feeder M is provided with bulls-eyesjor peep-holes with covers ofmica to permit of examination of the furnace at all times. Aninspection-door 70 may be located in the front of the feeder, above theflaps f, and is desirable when the chute supplying the feeder is aclosed chute. By the construction as shown very little air is allowed toenter through this feeder and that which does enter has to pass downunder the arch b and mingles with the gases rising from the fuel on thegrates. This feeder may be easily removed for repairs to itself or tothe wall or arch Z), and being below the level of the bottom of theboiler instead of on the top of the furnace, as is the present practice,it permits of the boilertubes being cleaned from their front end withoutthe removal of the feeder. The expense of the brickwork required for theconstruction of the furnace-front as shown in either bars 2?, Fig. 2,rest the step-ladder bearers s,

which are usually placed one on each side of the furnace and near to andparallel with the side walls, one or two intermediate bearers being alsoemployed, depending on the width of the furnace. Upon these step-ladderbearers 8 rest the grate-bars 0, while the short horizontal grate-bars Fat the rear of the furnace usually rest directly upon transverse bearerst. I make the bearing-beams shorter than is the present practice, theirlength being less'than the distance between the side walls. I supportthese beams by a suitable frame N. Said frame may be mounted upon wheelsn, formingacarriage, so that the grates may easily be withdrawn from thefurnaceinclosure through the ash-pit doors for the purpose of cleaningor for repairs either to the grates or to the brickwork. This frame Nmay form the step-ladder bearers, as shown in Fig. 1. The shortgrate-bars F may be set as heretofore, as shown in Fig. 2, or they mayalso be supported on the carriage N, as in Fig. 1. By the constructionshown in Fig. 1 the grates are, with their supports, independent of thebrickwork, and therefore the brickwork is not effected by the expansionand con-- traction of the beams due to the heat of the furnace. Justinside the front wall H in Fig. 1 and above the ash-pit door-opening areplates P, forming a surface sloping downward and rearward, startingfromabout the level of the hand-firing floor K and ending in what I terma drop-off pabove the top or upper step-ladder grate-bar 0. anchored tothe front wall H or are hooked near their upper end over an anchoredcrossbar 1% and rest upon another bar q, anchored under and near theirlower end so as to allow the plates P to expand and contract due to theheat of the furnace. The bearers m and g for these plates P may besupported by brackets r, projecting inward and secured to the side wallsor to the front wall H over the ash-pit door-opening. These brackets 1'may be provided with adjusting-screws by which the bearers m and 9 maybe altered in position for the purpose of adjusting the slope of theplates P. The upper surfaces of the plates P are made rough withcorrugations or serrations,

as shown in Figs. 10, 11, and 12, although I do not confine myself tothese shapes, theobject being to cause the bagasse when falling uponthese plates to rest and pile upon same and to prevent it from bouncingfrom said plates out into the furnace. The bagasse from the feeder Mfalls and piles upon the rough These plates P are surfaces of the platesP until the angle of repose is reached, beyond which the bagasse willslide down upon the top of the layer of fuel on the grates on account ofthe drop-off. This drop-off may be accomplished in various ways; butwhatever way effected it amounts simply to having the plates placed at ahigher elevation than that of the grates. It may be accomplished by theuse of a cast piece or pieces a above the top step-ladder grate-bar,upon which the lower end of the plates P rest, as in Fig. 2, or thesepieces a may rest upon or be part of the top step-ladder grates, bywhich the slope of the plates P is elevated above the slope of thestep-ladder grates 0. Special step-ladder bearers could be used madelonger at their upper ends than has heretofore been the practice, whichwould not only support the grate-bars, but also the plates P, with theirdrop-off 7) or with separate pieces to form said drop-off. Step-ladderbearers could be made as shown in Fig. 16, and while they would have theadvantage of the dropoff, yet they would be open to the objection ofallowing air to pass through between the upper grate-bars. which isdetrimental to the elficiency of the furnace. The openings between thesebars could, however, be plugged or filled with lire-clay or othersuitable material,

as shown dotted, and thus in a measure obtain the desired result. InFig. 2 a plate w is shown bolted to the bottom side of the feeder M toclose up the triangular-shaped opening at each side of the feeder andbetween the plates P, the front wall, and the bottom of the feeder.These plates '0 may also act as brackets and be bolted to the front walland aid in supporting the feeder.

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent, is

1. In a bagasse-burning furnace, the combination of the top B, the rearwall A extending upward so as to have a throatway C between it and thefurnace-top B, said wall A having the overhanging arch or ledge a, andthe front wall h depending from the furnacetop to near the level of theledge a.

2. In a bagasse-burning furnace, the combination of the top B having thewall I) depending from its front end, the rear wall A extendingvertically upward so as to leave a throatway C between it and thefurnace-top, an inclined step-ladder grate and an inclined floor havinga roughened surface extending from the upper end of the grate upwardpast the wall 7) to the feeding-door, said floor being raised above thelevel of the grate to form a drop-off.

3. In a bagasse-burning furnace, the combination of the top B, havingthe wall Z) depending from its front end, the rear wall A extendingvertically upward so as to leave a throatway C between it and thefurnace-top, an inclined step-ladder grate, an inclined floor extendingfrom the upper end of the grate upward past the wall I), and afeed-chute of which the wall I) forms the rear side.

4. In a bagasse-burning furnace, the combination of the top B having thewall I) depending from its front end, an inclined step ladder grate, aninclined floor extending upward from the grate under the wall 5, and afeed-chute delivering onto the floor, the wall 5 forming the rear wallof the chute.

5. In a bagasse-burning furnace, the combination of the top B having thewall 6 depending from its front end, a feed-chute of which the wall I)forms the back side, and a sectional weighted flap f in the chute.

6. In a bagasse-burning furnace, the combination of the top B having thewall 6 depending from its front end, a feed-door at substantially thelevel of the wall 6, afeed-chute of which the wall 5 forms the rearside, and a sectional weighted flap in the chute above the door.

7 In a bagasse-burning furnace, the combination of the rear wall Aextending upward so as to leave a throatway 0 between it and thefurnace-top, an inclined step-ladder grate, an air-flue in thewall-opening just above the lower end of the grate, frames 6 secured insaid openings, and removable twyers in said frames.

8. In a bagasse-burning furnace, the combination of the rear Wall Aextending vertically to near the furnace-top as shown, an inclinedgrate, an opening cut in the rear wall just above the lower end of thegrate, frames 6 secured in said opening and supporting the rear wall,and rectangular twyers removably secured in said frames.

9. In a bagasse-burning furnace, the combination of the wall 6 dependingfrom the front end of the top B and forming the back side of thefeed-chute, a door for hand feeding on substantially the level of thelower end of the wall I), said door having a hinged flap, and a weightedflap or flaps in the chute above the door for automatic feeding.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY GA BRIEL GINACA. l/Vitnesses:

GEO. I. THIELEN, Ron'r. J. PRATT.

